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    6．Having a walk after supper is certainly good for the old people，but it remainsto be seen （see）whether they will enjoy it．

    分析 晚饭后散步当然对老年人有好处，但是这也有待于看他们是否享受散步．

    解答 答案是to be seen．考查词组remain to do sth．有待于做某事．句意是"晚饭后散步当然对老年人有好处，但是这也有待于看他们是否享受散步．"but引导的从句中it是形式主语，真正的主语是whether引导的主语从句，主语从句和动词see之间是被动关系，所以用被动语态．所以答案是to be seen．

    点评 本题考查用所给单词的适当形式填空．首先要根据语境明确句意，然后再根据相关语法对所给单词在形式上做出正确的变动．

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